The Oura Ring is a discreet wearable device that measures and tracks several key health indicators, including your heart rate, body temperature, sleep quality and physical activity. When your Readiness Score, Activity Score, or Sleep Score (scores provided by Oura based on your biometrics) is 85 or higher, there will be a small crown icon next to the score on the Oura app. This is simply a visual signal that, based on the data Oura has, you are sufficiently rested and recovered for the day ahead.
The Oura app’s proprietary Readiness Score ranges from 0 to 100 and can help you determine your “readiness” for the day ahead. The score is calculated using short- and long-term data collected by your Oura ring based on your heart rate, sleep, and exercise. The readiness score also takes into account the menstrual cycle for menstruating people and pregnancy-related readiness factors for pregnant women.
The Sleep Score and Activity Score also range from 0 to 100. The Sleep Score is calculated based on the amount of time you sleep, the time it takes you to fall asleep, and the percentage of time during the total sleep period that you actually sleep. The activity score is based on your daily step count, workout volume and frequency, and your daily activity. It is possible to obtain a crown alongside one or two scores, or even all three.
How is the Readiness Score calculated?
Readiness Score uses your sleep and activity data, along with other health factors, to determine your overall readiness level. A high readiness score indicates that you are “ready to take on new challenges,” according to Oura. A lower score, however, indicates that you may need to focus on rest and recovery.
Your heart rate, body temperature, physical activity and sleep quality from the previous day are used in the calculation. Additionally, Oura includes three “Balance” metrics in the Readiness Score algorithm. These measurements compare data from the previous 14 days with data from the previous two months to determine overall trends in sleep quality, activity, and heart rate variability (HRV). HRV measures how much and how quickly your heart rate fluctuates. A high HRV may indicate that you are more resilient to life’s stressors, because your heart rate comes back down fairly quickly after an elevation. HRV can also be used to help determine overall heart health.
According to Oura, you can improve your readiness score by staying fairly active throughout the day, but avoiding vigorous or intense exercise. In the long term, your score can improve by prioritizing sleep and regular physical activity (without overexerting yourself). However, keep in mind that doctors think Oura works better as a sleep tracker than a fitness tracker.
How accurate is the Oura ring?
Your Readiness Score, Sleep Score, and Activity Score are as accurate as the data collected by your Oura Ring. According to a 2025 review of several academic studies, Oura’s sleep measurements are comparable in accuracy to sleep tests used for medical purposes. Oura’s exercise and energy expenditure calculations may be slightly less precise than laboratory tests for measuring small changes in physical activity, but these results are quite reliable. However, your numbers may not be completely accurate if you don’t wear the ring regularly or if it doesn’t fit properly.
Aiming to win a crown (or three) by getting scores of 85 or higher on the Oura app every day is a worthy goal. This can help you make positive changes for your health by prioritizing sleep, stress management, and balanced physical activity. However, it is important not to take these scores as indisputable truths. If your readiness score is lower than you expected, but you feel well-rested, energized, and motivated, you shouldn’t let the score hold you back. If your sleep score is high, but you feel exhausted, prioritize rest. These scores are useful tools, but it’s also important to check in with your body. Go for crowns if you want, but stressing out to earn them is counterintuitive to both your health and the purpose of scores.
